CVE-2019-5591KEV · OVERDUECWE-306

Fortinet FortiOS Default Configuration Vulnerability

Medium · published August 14, 2020

Patch now

The score understates this — it's already being exploited

CVSS calls it medium at 6.5. It is confirmed in active exploitation. It sits in the 97.3th percentile for exploit probability.

1634
days past CISA
deadline
CVSS v3.1
6.5
EPSS
19%
Percentile
97.3
In the wild
Confirmed
What it is

⚠️ A default configuration in FortiOS invites unauthenticated attackers to impersonate your LDAP server! It's like someone dressing up as the mailman and sneaking into your house to read your letters. 📬 Imagine a sneaky thief turning up at your door, dressed as the postal worker. They start rifling through your mail, reading sensitive letters, all because they exploited a simple oversight. This vulnerability in FortiOS lets attackers intercept sensitive information just by being on the same subnet! With this vulnerability, an attacker can gain unauthorized access to sensitive information by impersonating the LDAP server. This could lead to data breaches or unauthorized data modifications that could harm your organization. It's not the end of the world, but it’s definitely a serious risk that needs addressing!

Put simply

Imagine a sneaky thief turning up at your door, dressed as the postal worker. They start rifling through your mail, reading sensitive letters, all because they exploited a simple oversight. This vulnerability in FortiOS lets attackers intercept sensitive information just by being on the same subnet! This vulnerability allows unauthenticated attackers on the same subnet to intercept information by impersonating the LDAP server due to default settings in FortiOS. Essentially, if left unaddressed, it creates a gateway for potential data compromise.

What to do

With this vulnerability, an attacker can gain unauthorized access to sensitive information by impersonating the LDAP server. This could lead to data breaches or unauthorized data modifications that could harm your organization. It's not the end of the world, but it’s definitely a serious risk that needs addressing! To secure your systems, modify the default configurations and ensure that LDAP server authentication is properly enforced. Regularly audit your network configurations and apply any available patches to FortiOS to close this gap. Don't leave your doors wide open! You've got this! Act fast and secure your FortiOS setup to keep those sneaky thieves at bay! 🛡️

The record
Technical detail
CVSS v3.1
6.5 · MEDIUM
Vector
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
CVSS v4.0
Not supplied
EPSS
0.18566 · 97.3th percentile
Weakness
CWE-306 · Missing Authentication for Critical Function
Published
2020-08-14T20:15Z
KEV added
2021-11-03 · due 2022-05-03
Affected products (1)
ProductVersionsFixed in
fortinet/fortios≤ 6.2.0—
References (3)
EPSS history
Timeline
  • 03 NOV 00:00Z
    Added to CISA KEV — remediate by May 3
    kev
  • 14 AUG 15:28Z
    A Default Configuration vulnerability in FortiOS may allow an unauthenticated attacker on the same subnet to intercept sensitive information by impersonating…
    cvelistv5